4. Let X₁, X2, Xn represent a random sample from a distribution with E(X) = 0. Consider two estimators of 0: 0 = X1 and 0₂ = X. (a) Show that both estimators ₁ and 2 are unbiased estimators of 0. (b) Let Var(X) = o², find Var(8₁) and Var(82) in terms of o². (c) Which of these estimators, ₁ or 02, is better? Justify your answer.

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